Diaper Etiquette for Guests

Whenever she visits, my sister changes her daughter's diaper on my new sofa, then sticks the soiled one in the kitchen garbage, where it sits until someone carries out the bag. I'm disgusted -- can I complain to her?

Your sister should know better, but try to handle this without going on the attack -- no lecture, just solutions. Next time she pops in, tell her you've left a towel on your bed for changing time. If she never brings her own supply of plastic bags and twist ties, have those on standby, too. When she's done the deed, ask her to please place the bag in the trash can outside. Should she balk anywhere along the line, simply tell her those are your house rules.